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 Oracle  |  Question 41 of 76    Print  
How does the index work internally? Provide some examples in different criteria and explain...

  
Total Answers and Comments: 1 Last Update: July 30, 2007     Asked by: Iniyavan 
  
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July 30, 2007 01:42:48   #1  
Asad        

RE: How does the index work internally? Provide some e...
Index are reference to data in tables's columns on what they are based. Index work exactly in way  like we have book's index describing its chapters and what page # chapter can be found.

They only contain reference to the data. There are two types on index.

B-tree index and bit map indexes.

Where data cardinality (uniqueness) is low, bitmap is good candidate for the data otherwise b-tree indexes would help. They are used to access data through reference (row-id) which is fastest method to access data on disk.

Index also affect optimizer decision as how to access data. choice of index (bitmap or b-tree) can be also dependant on application (either DSS or OLTP).

 
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